I just forked over $1000 for 4 installed - Sailun 637 on my Jayco 345. I have G614's on my horse trailer and are good. I threw the tread on one, but tire stayed intact. Goodyear gave me a re-tread so still on trailer. I just couldn't justify the $400/tire versus $205 for the Sailun. I am in Alberta so Sailun only available at Kal Tire. They have put on quite a few over the past year and so far they are not hearing about any problems. They could have sold me Carlisle ST's for more money, but felt the Sailun was a better choice in their opinion. I personally don't like ST tires(that's a different post). I pressured them up to 95psi giving me a little extra weight rating than I had on the Load E. Heading to Montana next week, fully loaded, so first real test.